City of Sin (Yanyu Jiangnan) - Vol 1 Chapter 3: Enlightenment

The ill-fated high school student Liu Yuan obtained the inheritance of the top civilization in the universe and changed his own destiny. He also used many powerful technologies in the inheritance to lead the Chinese nation to rise in the universe.

- Description from novelbuddy

Ruins stretched across the landscape in the apocalypse after the nuclear war.

“Beast Forge? What the hell is that?”He thought while walking out of the alley. The streets were almost empty, with only the homeless wandering around, picking up anything valuable that was dropped. He walked over to join them, still thinking he needed to do this to survive. But as he bent down, a black screen appeared in front of him, with white text displayed on it.[Beast Forge system activatedUser successfully registeredScanning user... doneUser has not awakened, cannot use Beast Forge.Analyzing for possible solutions.... doneMission: Run 10 km before 00:00Reward: Force awakeningFailure: Loss of the Beast Forge systemWill you accept this mission: YES/NO]

“Destiny is a matter of Choice not Chance,

It is not a thing to be waited for but a thing to be Achieved”

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The story sets in a mana blessed world, Planet Vermillion, where every being possesses a System.

At the edge of his life, Zero, a man without a System, finally loses everything and embraces his death with a tired yet relieved expression.

As if by fate, the owner of the system approaches Zero through a screen and gives him a chance to connect with the System, however Zero denies it in exchange for a chance to change or undo all the mistakes he has done in his life.

The owner of the System accepts Zero’s wishes but at a certain price and sends Zero back into the past.

Still without a System, but with the knowledge of the future and various skills honed over the years, Zero begins his new journey to change everything he could.

Save everyone who needs to be saved and kill everyone who needs to be killed.

However, the more he moves forward, the more he realises that the ‘truths’ which he had known in his previous life are much more complicated than what they seem.

Balancing his previous beliefs and the new found mysteries that could shatter his perspective, he still keeps moving forward despite things getting more chaotic with every step.

As if fate itself wanted him to fall, an unknown disaster approaches him from behind and a familiar screen comes in front of him

[Ummm… Zero. It might be a bit late but… Looks like I have messed up big time]